English verb conjugation MUST STIFFER

Regular verb: stiffer - stiffered - stiffered

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form

I must stiffer
you must stiffer
he must stiffer
we must stiffer
you must stiffer
they must stiffer

V-ing form

I must be stiffering
you must be stiffering
he must be stiffering
we must be stiffering
you must be stiffering
they must be stiffering

Perfect

I must have stiffered
you must have stiffered
he must have stiffered
we must have stiffered
you must have stiffered
they must have stiffered

V-ing perfect

I must have been stiffering
you must have been stiffering
he must have been stiffering
we must have been stiffering
you must have been stiffering
they must have been stiffering

Negation

Simple form

I mustn't stiffer
you mustn't stiffer
he mustn't stiffer
we mustn't stiffer
you mustn't stiffer
they mustn't stiffer

V-ing form

I mustn't be stiffering
you mustn't be stiffering
he mustn't be stiffering
we mustn't be stiffering
you mustn't be stiffering
they mustn't be stiffering

Perfect

I mustn't have stiffered
you mustn't have stiffered
he mustn't have stiffered
we mustn't have stiffered
you mustn't have stiffered
they mustn't have stiffered

V-ing perfect

I mustn't have been stiffering
you mustn't have been stiffering
he mustn't have been stiffering
we mustn't have been stiffering
you mustn't have been stiffering
they mustn't have been stiffering

Interrogative form

Simple form

must I stiffer?
must you stiffer?
must he stiffer?
must we stiffer?
must you stiffer?
must they stiffer?

V-ing form

must I be stiffering?
must you be stiffering?
must he be stiffering?
must we be stiffering?
must you be stiffering?
must they be stiffering?

Perfect

must I have stiffered?
must you have stiffered?
must he have stiffered?
must we have stiffered?
must you have stiffered?
must they have stiffered?

V-ing perfect

must I have been stiffering?
must you have been stiffering?
must he have been stiffering?
must we have been stiffering?
must you have been stiffering?
must they have been stiffering?

Interro-negative form

Simple form

mustn't I stiffer?
mustn't you stiffer?
mustn't he stiffer?
mustn't we stiffer?
mustn't you stiffer?
mustn't they stiffer?

V-ing form

mustn't I be stiffering?
mustn't you be stiffering?
mustn't he be stiffering?
mustn't we be stiffering?
mustn't you be stiffering?
mustn't they be stiffering?

Perfect

mustn't I have stiffered?
mustn't you have stiffered?
mustn't he have stiffered?
mustn't we have stiffered?
mustn't you have stiffered?
mustn't they have stiffered?

V-ing perfect

mustn't I have been stiffering?
mustn't you have been stiffering?
mustn't he have been stiffering?
mustn't we have been stiffering?
mustn't you have been stiffering?
mustn't they have been stiffering?

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